Isabelle is mixing red paint with blue paint to make purple paint. she adds of a fluid ounce 3/10 of red to 11/15 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple. how many fluid ounces of red paint will she need to make 3 fluid ounces of purple paint?

if you will tell me how to do this and show me what you did? ?